Tokyo's key Nikkei index closed lower on Friday on worries over the US-China trade war while traders eyed the US-Japan summit which will be held early next week.

File photo: VCG

The benchmark Nikkei 225 index lost 0.16 percent, or 33.92 points, to end at 21,117.22, while the broader Topix Index edged up 0.04 percent or 0.63 points at 1,541.21.